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There is a newer version: 1.43.0

package com.transferwise.tasks.config;

import com.transferwise.tasks.config.ResolvedValue.ResolvedValueValidator;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import javax.validation.Constraint;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.Payload;

@Documented
@Constraint(validatedBy = ResolvedValueValidator.class)
@Target({ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface ResolvedValue {

  String message() default "Unresolved value.";

  Class[] groups() default {};

  Class[] payload() default {};

  class ResolvedValueValidator implements ConstraintValidator {

    @Override
    public void initialize(ResolvedValue contactNumber) {
    }

    @Override
    public boolean isValid(String field, ConstraintValidatorContext ctx) {
      return field == null || !field.contains("${");
    }
  }
}